Posterior impression tray



FIG. 1 is a top plan view of a posterior impression tray showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is an inverted right side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a front elevational view thereof; and

FIG. 7 is a top perspective view thereof. 

The ornamental design for a posterior impression tray, as shown. 